Some fields have to be able to be blank

contest/models.py

@@ -8,7 +8,7 @@ from .validators import CallUsernameValidator
 class Contest(models.Model):
 	name = models.CharField(max_length=20)
 	shortName = models.CharField(max_length=20, unique=True)
-	callQrg = models.ForeignKey("Frequency", null=True)
+	callQrg = models.ForeignKey("Frequency", null=True, blank=True)
 
 	def __str__(self):
 		return self.name
@@ -41,7 +41,7 @@ class Frequency(models.Model):
 	qrg = models.DecimalField(max_digits=7, decimal_places=3)
 	band = models.ForeignKey(Band)
 
-	note = models.CharField(max_length=50)
+	note = models.CharField(max_length=50, blank=True)
 
 	def __str__(self):
 		return "Channel %s: %s MHz" % (self.channel, self.qrg)